Butterfly mop



FIG. 1 is a top right front perspective view of a butterfly mop showing my new design; the broken line drawing of a sponge is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof; the right side elevational view being a mirror image;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a butterfly mop, as shown and described. 